#include<stdio.h>
int main(void)
{
    int i,j;
    unsigned long s=0;
    unsigned long t;
    for(i=1;i<=10;i++)
    {
        t=1;
        for(j=1;j<=i;j++)
        t=t*j;
        printf("%d!=%lu.\n",i,t);
        s=s;
    }
    printf("s=%lu.\n",s);
    return 0;
}
